package operator;

public class Demo07 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        //a+=b;//a = a+b
        b-=a;//a = a-b

        System.out.println(b);
        System.out.println();
        //字符串连接符  +
        System.out.println(a+b+"");
        System.out.println(""+a+b);

    }
}
